4, 7, 9, 10 are the weakest to me. I wanted to say 14 too, not that it's a bad image but for some reason it doesn't flow with the rest to me. Well maybe not with the colored jellyfish. Don't forget order too when you show your work for class.
and yes you need to learn self editing skills but it helps to have other eyes sometimes IMO, I know especially with projects you've been staring at for so long. Obviously consider people's opinions but if you feel strongly about certain ones, keep them.